# US 12,119,686 B2 · Power source system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,119,686 B2 - Document ID: US12119686B2 - Status: Granted - Kind: B2 - Application number: 17/383,621 - Filed: 2021-07-23 - Published: 2021-11-11 - Granted: 2024-10-15 - Earliest claimed: 2019-01-23 - Assignees: Denso Corporation - Applicants: Denso Corporation - Inventors: Tomomichi Mizoguchi - Web page: https://patentgrep.com/patent/US12119686B2 ## CPC - H02J 7/63: against overdischarge - B60L 1/00: Supplying electric power to auxiliary equipment of vehicles (circuit arrangements for charging batteries H02J7/00) - B60L 53/00: Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles - H02H 7/18: for batteries; for accumulators - H02J 7/80: including monitoring or indicating arrangements - H02J 7/96: in response to battery voltage - H01M 2220/10: Batteries in stationary systems, e.g. emergency power source in plant - H01M 2220/20: Batteries in motive systems, e.g. vehicle, ship, plane - H01M 2220/30: Batteries in portable systems, e.g. mobile phone, laptop - H02J 7/50: acting upon multiple batteries simultaneously or sequentially - Y02T 10/70: Energy storage systems for electromobility, e.g. batteries - Y02T 10/7072: Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors - Y02T 90/14: Plug-in electric vehicles - H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY - B60L: PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES (arrangements or mounting of electrical propulsion units or of plural diverse prime-movers for mutual or common propulsion in vehicles B60K1/00, B60K6/20; arrangements or mounting of electrical gearing in vehicles B60K17/12, B60K17/14; preventing wheel slip by reducing power in rail vehicles B61C15/08; dynamo-electric machines H02K; control or regulation of electric motors H02P); SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES (electric coupling devices combined with mechanical couplings of vehicles B60D1/64; electric heating for vehicles B60H1/00); ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL (control or regulation of electric motors H02P); MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES - H02H: EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS (indicating or signalling undesired working conditions G01R, e.g. G01R31/00, G08B; locating faults along lines G01R31/08; emergency protective devices H01H) - H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract Provided is a power source system including: a storage battery; a control unit operating by being supplied with power from the storage battery and monitoring the storage battery; a first switch configured as a latch type switch disposed on a first electrical path between the storage battery and the control unit; and a second switch configured as a latch type switch disposed on a second electrical path between the storage battery and an electrical equipment as an object to which the storage battery supplies power. The first switch and the second switch are connected in parallel to the control unit; current is supplied to the control unit from the storage battery; and the control unit includes a switch control unit configured to stop a current supply to the control unit from the storage battery. ## Claims ### Claim 1 A power source system comprising: a storage battery; a control unit operating by being supplied with power from the storage battery and monitoring the storage battery; a first switch configured as a latch type switch disposed on a first electrical path between the storage battery and the control unit; and a second switch configured as a latch type switch disposed on a second electrical path between the storage battery and an electrical equipment as an object to which the storage battery supplies power, wherein the first switch and the second switch are connected in parallel to the control unit; current is supplied to the control unit from the storage battery in a state where the first switch and the second switch are closed; and the control unit includes a switch control unit configured to stop a current supply to the control unit from the storage battery by changing the first switch and the second switch to be opened. ### Claim 2 (depends on 1) The power source system according to claim 1, wherein a first connection point between the first switch and the control unit on the first electrical path is connected to a second connection point between the second switch and the electrical equipment on the second electrical path, whereby the first switch and the second switch are connected in parallel to the control unit; a first rectifying element disposed between the first switch and the first connection point on the first electrical path, such that a forward direction thereof is a direction towards the first connection point from the first switch; and a second rectifying element disposed on a third electrical path between the first connection point and the second connection point, such that a forward direction thereof is a direction towards the first connection point from the second connection point. ### Claim 3 (depends on 1) The power source system according to claim 1, wherein the power source system is configured to activate the control unit at a predetermined period in a system suspended state and perform, when activating the control unit, an opening/closing control for the first switch and the second switch by the switch control unit; the control unit comprises: a first fault determination unit that determines a state where the first switch is in an abnormal opened state based on a voltage in an anti-storage battery side between both end voltages of the first switch; and a second fault determination unit that determines a state where the second switch is in an abnormal opened state based on a voltage in an anti-storage battery side between both end voltages of the second switch; the switch control unit is configured to output a latch command signal to the first switch for closing the first switch under a state where the first fault determination unit determines the abnormal opened state of the first switch; and the switch control unit is configured to output a latch command signal to the second switch for closing the second switch under a state where the second fault determination unit determines the abnormal opened state of the second switch. ### Claim 4 (depends on 3) The power source system according to claim 3, wherein the control unit further comprises a third fault determination unit that determines, based on a voltage in the anti-storage battery side between both end voltages of the first switch, that a cutoff fault occurs on the first electrical path; and the switch control unit is configured not to output a latch command signal to each switch in the opening/closing control during the system suspended state, in the case where the third fault determination unit determines that a cutoff fault occurs on the first electrical path. ### Claim 5 (depends on 1) The power source system according to claim 1, wherein the control unit is configured to be capable of being activated in the case where the first switch and the second switch are opened states, by a power supplied from an external power source connected to an external connection terminal; the control unit comprises: a voltage acquiring unit that acquires a battery voltage of the storage battery; and an external power supply determination unit that determines a power supplied state where power is supplied by the external power source; the switch control unit comprises: a first control unit that changes the first switch and the second switch to be opened states in the case where the battery voltage is lower than a first threshold; a second control unit that changes the first switch and the second switch to be closed states under a state where the battery voltage of the storage battery is higher than a second threshold which is lower than the first threshold, in the case where the first control unit changes the first switch and the second switch to be opened states and the power supplied state by the external power source is determined. ### Claim 6 (depends on 5) The power source system according to claim 5, wherein a first connection point between the first switch and the control unit on the first electrical path is connected to a second connection point between the second switch and the electrical equipment on the second electrical path, whereby the first switch and the second switch are connected in parallel to the control unit; and the control unit is connected to the external connection terminal via a third electrical path between the first connection point and the second connection point. ### Claim 7 (depends on 6) The power source system according to claim 6, wherein an activation switch of the control unit is provided on a signal path between the control unit and the external connection terminal; and the external power supply determination unit is configured to determine, based on an activation signal transmitted via the signal path, the power supplied state where power is supplied by the external power source.